Thanks for your question! This is just for refilling the coolant reservoir and the adapters attach to your specific reservoir size to ensure you don't spill the new coolant and prevent air bubbles. You would need to drain and flush your cooling system prior to refilling with this kit. Our instruction manual for this can be found: cdn.shopify.com/s/files/1/0552/3508/4462/files/71005_Manual_final_outlines.pdf?v=1692034697
